Status Update on ALMA Band 1 Receiver Development

Status Update on ALMA Band 1
Receiver Development
Chau-Ching Chiong on behalf of
ALMA Band 1 Team
ASTE / ALMA Development Workshop 2014
Team
• ALMA Band-1 is ALMA-EA project, with collaboration
with U. Chile, NRAO and HIA.
• Approved by ALMA Board for proto-typing.
• PI: Ciska Kemper , Co-PI: Paul Ho (ASIAA).
• Project manager: Ted Huang (ASIAA)
• Science team led by Oscar Morata (ASIAA)
• Engineering team led by Yuh-Jing Hwang.
• Mass production in CSIST (former FEIC team)
Overview
• System block diagram and designers/suppliers
ASIAA
NRAO
NAOJ and U Chile
HIA
RF: 35-51 GHz, LO: 31-39 GHz,
IF: 4-12 GHz, SSB
Trx: 25-32 K
Optics and Horn
• Optics contributes large noise (~10K)
due to thick lens.
• Horn close to the 15K filter to reduce
truncation.
• Verification of simulated results is in
urgent.
OMT
• Received one proto-type OMT from HIA
Cryogenic LNA
• Received two
proto-type LNAs
from NRAO
• Connected with
OMT and horn now
under testing
ORL
IRL
LNA Noise Temperature Summary
RT Stability Test of LNA
Allan Variance of LNA QA001 with IF Filter
1E-04
1E-05
1
2
3
4
5
6
Duration
47min
34min
34min
34min
33min
34min
Temperature
295.9K ±0.2
295.6K ±0.05
295.5K ±0.04
295.2K ±0.1
295.0K ±0.08
294.9K±0.07
Amplitude
1E-06
1E-07
2,3,4,5,6
1
1E-08
1E-09
0.01
0.1
1
10
100
Time (s)
1
2
3
4
5
6
Spec. (0.05~100 s)
Spec. (300 s)
1000
Solar Observation
• Advantage of HEMT
receiver
• High saturation
power
• Gain control
flexible
• Little noise
degradation
40
Normal operation
S-parameter (dB)
30
Stage 4 off
20
Stage 3&4 off
10
S21
0
-10
S11
S22
-20
-30
30
32
34
36
38 40 42 44
Frequency (GHz)
46
48
50
• Good gain flatness
by using active
mixer.
• New version will
cover up to 52 GHz.
20
18
Conversion Gain (dB)
Downconverter
22
16
14
12
LO28GHz, RF32-40GHz
LO29GHz, RF33-41GHz
LO30GHz, RF34-42GHz
LO31GHz, RF35-43GHz
LO32GHz, RF36-44GHz
LO33GHz, RF37-45GHz
LO34GHz, RF38-46GHz
LO35GHz, RF39-47GHz
LO36GHz, RF40-48GHz
LO37GHz, RF41-49GHz
LO38GHz, RF42-50GHz
10
8
6
4
2
RF in
0
32.0G
34.0G
36.0G
38.0G
40.0G
42.0G
44.0G
46.0G
RF Frequency (Hz)
IF out
LO in
48.0G
50.0G
Image Band Rejection
• Low sideband rejection is provided by filter.
• Planar filter for higher integrity
• If no isolator is required, RF amplifier + filter + mixer + IF
amplifier/filter can be in single packaging → saving
assembling time and manpower
Local Oscillator
• Received some common components
– Empty WCA, YIG oscillator, Bias board
• Working on the new biasing scheme for
down-converter.
• No 51-52 GHz range by current Laser
Synthesizer
LO Noise
• Phase noise measurement at LO=40 GHz
• Phase noise in jitter: 15.9 fs (spec. 38 fs)
Cartridge Designs
CCA
WCA
Vibration Test
• Dummy components
• Eigen-frequency ~ 90 Hz > 70 Hz (ALMA spec)
gn
20.0000
input1(f): Peak=0.508
1
2
input1(f)
10.0000
low-alarm(f)
3
high-alarm(f)
1.0000
0.1000
Z
1
2
3
0.0100
5.00
Signal
input1(f)
input1(f)
input1(f)
X
91.27
208.871
321.714
Y
16.4429
14.0109
3.47069
10.00
100.00
Frequency (Hz)
X
Y
500.00
Production Plan
• FEIC team will be responsible for the production of
Band 1.
• Test flow and testing equipments are under review.
• Micro-assembling tasks, quality control, system
integrating, verification and alignment.
Timeline towards CDR
• Critical Design Review will be in July 2015…
• Finalize all designs in Sept. 2014.
• Finish integrating test equipment in Sept. 2014.
• First proto-type receiver (SN00) in Dec. 2014.
• Finish RF evaluation of first proto-type in Mar.
2015.
• Second proto-type (SN0) in March 2015.
• Finish RF measurement of SN0 in May 2015.

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